JPS5832195Y2 - display tube display device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a display tube display device installed in a mode switching device such as a tape recorder. It is an object of the present invention to provide a display device that has a small number of parts and can integrally and compactly configure an operation part and a display part.

As one of the display devices provided in conventional mode switching devices such as tape recorders, a push part is provided with characters such as play, fast forward, etc., or symbols symbolizing these, etc. printed on the surface of the push part. There is a push switch type that lights up a lamp or the like provided on the back side of the push part by operating the push part.

・However, this device has a large number of parts because the push-motion part and the light-emitting part such as a lamp are separate parts, and the entire device can be made compact. There were drawbacks such as the large amount of man-hours required to print letters, figures, etc. on the copies.

The present invention eliminates the above-mentioned drawbacks, and the embodiments thereof will be described below with reference to the drawings.

Figures 1A and 1B show the first part of the display tube display device according to the present invention, respectively.
1 shows a plan view and a vertical cross-sectional view of a part of the embodiment applied to a mode switching device of a tape recorder.

In the figure, reference numeral 1 denotes a fluorescent display tube, and on the inner lower surface corresponding to the surface, fluorescent bodies 2a to 2e have symbols for playback, fast forward, rewind, recording, and stop modes, respectively, as shown in FIG. Anode electrodes 3a to 3e are provided with a display surface formed on the surface thereof, and a grid 4 and a filament 5 are provided above the anode electrodes 3a to 3e, which are fixed to an operation panel 6.

Reference numerals 71 and 72 are transparent, bright touch electrode parts, and a detection signal is extracted by direct contact with a finger, that is, a human body.

Comb-shaped conductive parts 81 and 82 are alternately vapor-deposited on the upper surface 1a of the fluorescent display tube 1 at positions facing the phosphor 2a and slightly separated from each other.

That is, the touch electrode parts 71 and 72 are provided using the tube of the fluorescent display tube 1 as an insulator.

This pair of touch electrode parts T1 and 72 are connected to the other fluorescent material 2.
Similarly, the terminals b to 2e are provided facing each other, and one terminal is connected to the power supply and the other terminal is connected to the ground.

Note that a low voltage is always applied to the anode electrodes 3a to 3e, so that the phosphors 2a to 2e emit light with low brightness even when the touch electrode sections 71 and 72 are not operated.

Here, when performing reproduction, as shown in FIG. and T
2 is shorted via finger 15.

As a result, as shown in FIG.
The potential of is lowered, and this potential is amplified and supplied to the Schmitt trigger circuit 10 to trigger it.

The pulse signal taken out from the Schmint trigger circuit 10 is supplied to a flip-flop 11 to set it.
The drive circuit 12 outputs a display tube drive signal based on the set signal from the flip-flop 11.

This drive signal is supplied to a power supply circuit (not shown) provided for the anode electrode 3a of the fluorescent display tube 1, whereby a higher voltage than usual is applied to the anode electrode 3a, and the fluorescent display tube 1 is supplied with a higher voltage than usual. The light body 2a emits light with a higher brightness than the other fluorescent bodies 2b to 2e.

In FIG. 2, a series of circuits such as a trigger circuit 10 and a flip-flop 11 are similarly provided for the other phosphors 2b to 2e, and are operated in the same manner as in the above case according to mode switching. , the fluorescent bodies 2b to 2e may be made to emit light.

Incidentally, at the same time as the flip-flop 11 is reset, the flip-flops 11 provided corresponding to other phosphors are reset, and at the same time the phosphor 2a emits light, the flip-flop 11 is reset.
The phosphor provided corresponding to 1' is configured to be turned off.

As described above, in the present invention, the fluorescent bodies 2a to 2e symbolized by the fluorescent display tube 1 are displayed by emitting light, and the touch electrode portion 71y72 is constructed using the tube as an insulator, so that the push button as in the conventional method is not used. Compared to a display device using a switch or the like, the entire device can be formed integrally and compactly, and it is also cheaper because the tube itself is used as an insulator.

FIG. 3 shows a longitudinal sectional view of a second embodiment of the device according to the invention.

In the figure, 1 is a fluorescent display tube, which is similar to that of the first embodiment.
Inside there are fluorescent bodies 2a to 2e and anode electrodes 3a to 3e1.
A grid 4 and a filament 5 are provided.

Reference numeral 13a denotes a transparent conductive plate, which is deposited on the back surface of the upper surface portion 1a of the fluorescent display tube 1 at a position facing the phosphor 2a.

As will be described later, this conductive plate 13a, together with the finger 15 placed on the upper surface portion 1a, substantially constitutes a capacitor using the tube itself as an insulator, and is detected by indirectly connecting the finger, that is, the human body. This is a detection pole for extracting signals.

This conductive plate 13a is also provided facing the other fluorescent bodies 2b''2e, and is connected to an oscillator, which will be described later.

Here, as shown in FIG. 3, when the upper surface 1 a' of the fluorescent display tube 1', which is located above the conductive plate 13a facing the fluorescent body 2a, is touched with a finger 5, the conductor 13a and finger 1
The stray capacitance between 5 and 5 changes.

As a result, as shown in FIG. 4, the oscillator 14
3a, the finger 15, and the upper surface portion 1a' of the fluorescent display tube 1, the output oscillation frequency changes as the capacitance of the capacitor C changes, and a signal with a frequency fo is extracted from the oscillator 14.

This signal is amplified by an amplifier 9, filtered by a bandpass filter 16 having a center frequency fo, and then filtered by a Schmitt trigger circuit 1.
0 to trigger this.

Thereafter, by the same operation as in the first embodiment, a higher voltage than usual is applied to the anode electrode 3a, and the phosphor 2a emits light with a higher brightness than the other phosphors.

Other operations and effects are similar to those of the first embodiment, so their explanation will be omitted.

As described above, the display tube display device according to the present invention has a display surface for displaying figures, symbols, etc. on the inner lower surface corresponding to the surface of the fluorescent display tube, and has a display surface for displaying figures, symbols, etc. on the surface of the fluorescent display tube. A drive circuit that is provided with a detection pole for extracting a detection signal by direct or indirect contact, and is activated by the detection signal from this detection pole to display figures, symbols, etc. on the display surface corresponding to the touched part. Because it is configured with
Compared to the conventional push switch type display device in which the operation part and the light-emitting part are configured separately, the number of parts is reduced, and the entire device can be formed compactly in one piece. Since there is no need to print characters, figures, etc. for display on the operation part, it can be manufactured with less man-hours, and furthermore, since the tube itself is used as an insulator, it can be constructed at low cost.

[Brief explanation of the drawing]

1A and 1B are a plan view and a vertical sectional view of a part of the first embodiment of the device of the present invention applied to a mode switching device of a tape recorder, respectively, and FIG. 2 is a partial view of the device shown in FIGS. 1A and 1B. FIGS. 3 and 4 are a longitudinal sectional view of a second embodiment of the device of the present invention and a block diagram of a circuit for driving the same, respectively. 1.1'... Fluorescent display tube, 1 a? 1 a'...
・Top part, 2a to 2e... Fluorescent material, 3a to 3e...
Anode electrode, 1□, 72...touch electrode part, 8□,
82... Conductive part, 10... Schmitt trigger circuit,
DESCRIPTION OF SYMBOLS 11, 11'... Flip-flop, 12... Drive circuit, 13a... Conductive plate, 14... Oscillator, 15
...Finger, 16...Band filter.

Claims (1)

[Scope of utility model registration request] A front direction for displaying graphic symbols, etc. is provided on the inner lower surface corresponding to the surface of the fluorescent display tube, and a detection signal is taken out when a human body comes into direct or circumferential contact with the surface of the fluorescent display tube. A display tube display device comprising: a detection electrode; and a drive circuit which is activated by a detection signal from the detection electrode to display figures, symbols, etc. on the display surface corresponding to the touched portion.